Pvt Rm for b-day party for 30-40 in Park Slope, W'Burg, Fort Greene...

We want to host a casual b-day party for about 30-40 ppl. We'd like a restaurant or pub with a private room or space for a casual lunch buffet, brunch or heavy Hors D'oeuvres. Nice setting, but need not be fancy. Open to lots of neighborhoods: Park Slope, W'Burg, Fort Greene, Clinton Hill, Carroll Gardens...thank you for your help and suggestions!